Impact of SEI Lithium Salts on Cycling Ability and effect of Complexant Additives

Li-ion batteries are undoubtedly the most popular and mature electrochemical storage devices. Numerous studies deal with the development of new materials and electrolytes for such systems [1-3]. However, there are several factors that limit the development of this technology, and one of the key questions is the limitation the life time. Efficient cycling of lithium-ion batteries is associated with the formation of a passivation layer at the electrodes surface, referred to as the SEI (Solid Electrolyte Interphase) [4]. The quality of this film is decisive for battery performance: it must prevent solvent intercalation in the electrode, limit electrolyte degradation upon cycling, but still allow an optimal transport of Li ions between the electrode and the electrolyte.